Decay heat removal using feed-and-bleed for US pressurized water reactors

Technical Report · Wed Jun 01 04:00:00 EDT 1988

OSTI ID:6979724

Loomis, G G; Cozzuol, J M

As part of a United States Nuclear Regulatory Commission (USNRC) evaluation of current decay heat removal methods, the adequacy of feed-and-bleed decay heat removal has been assessed for United States pressurized water reactor (USPWRs). Use of feed-and-bleed for decay heat removal becomes necessary in a pressurized water reactor (PWR) system if there is a loss of steam generator heat sink capability. The feed-and-bleed technique involves passing hot fluid out of the primary system through a pressurized power operated relief valve (PORV), while simultaneously feeding the primary system with subcooled high pressure injection system (HPIS) flow, charging flow, or both. This document summarizes the results of available experimental and analytical work that has been performed to investigate the thermal hydraulic phenomena associated with the feed-and-bleed technique. The results are then synthesized into a statement of adequacy of the feed-and-bleed technique as a means of decay heat removal. It is concluded that feed-and-bleed can be a viable alternative form of decay heat removal for USPWRs, but that successful use of feed-and-bleed is contingent upon the existence and use of procedures for its implementation, as well as upon the specified of plant design.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Reactor and Plant Systems; EG and G Idaho, Inc., Idaho Falls (USA)
• OSTI ID: 6979724
• Report Number(s): NUREG/CR-5072; EGG-2526; ON: TI88012341
• Country of Publication: United States
• Language: English

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ACCIDENTS
AFTER-HEAT REMOVAL
COMPUTER CODES
CONTROL EQUIPMENT
COOLING SYSTEMS
DATA
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
EXPERIMENTAL DATA
FLOW REGULATORS
FLUID MECHANICS
HEAT TRANSFER
HYDRAULICS
INFORMATION
LOSS OF COOLANT
MECHANICS
NUMERICAL DATA
PWR TYPE REACTORS
R CODES
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR SAFETY
REACTORS
REMOVAL
SAFETY
TRANSIENTS
VALVES
WATER COOLED REACTORS
WATER MODERATED REACTORS